Enhanced performance data connector

Abstract: A shielded electrical data connector (10) terminates a shielded multiconductor cable. The data connector includes an insulative housing having a conductive housing shield (16, 18) therein. A contact holding member (36) is accommodated in the connector housing and supports a row of plural spaced electrical contacts (52) thereon. A contact shield (38) is supported by the contact holding member. The contact shield has a shield extension (68) extending between at least two of the contacts so as to reduce cross-talk as between the two contacts. The contact shield (38) is electrically commoned with the housing shield (16, 18) to maintain continuous electrical shielding.

Description: FIELD OF THE INVENTION: The present invention relates generally to improvements in shielded electrical data connectors. More particularly, the present invention relates to a shielded electrical data connector having enhanced performance. BACKGROUND OF THE INVENTION: The use of electrical connectors to terminate electrical cable carrying data transmission signals is well-known. Electrical connectors of this type are shown in numerous patents including U. S. Patent No. 4,449,778, U. S. Patent No. 4,501,459 and U. S. Patent No. 4,619,494. Each of the connectors described in these patents includes a connector shield. Shielded connectors provide protection from electromagnetic and radio frequency interferences (EMI and RFI) which may be present in the environment. Recently, the industry has been increasing the rate of data signal transmission along the data cable. Data rates of 100 mbps are now being achieved. These increased data rates result in an increase in the cross-talk levels between the conductors of the cable, which are terminated in the electrical connector. While the shielding provided in the above-identified data connectors is adequate for the lower transmission rates, it has been found that this shielding may not be sufficient for the increased signal rates. At high data rates, the cross-talk problem is particularly prevalent as between adjacent pairs of contacts supported in the data connector housing. Improvements in data connector shielding have been attempted. U. S. Patent No. 5,030,115 shows an improved data connector shield overcoat. However, improvements such as this do not address cross-talk. It is, therefore, desirable to provide an electrical connector which provides improved shielding to reduce the cross-talk between contact pairs at high data rates. US-A-4619494 mentioned above discloses a data connector comprising an insulative housing having a conductive housing shield therein, an insulative contact holding member supporting a row of plural spaced electrical contacts therein, the insulative housing accommodating the holding member. However, there is no cross-talk shielding. DE-A-4040551 discloses a data connector having an insulative housing a conductive housing shield therein, the housing supporting a row of electrical contacts, and a series of individual contact shields between the contacts. EP-A-0268441 discloses a data connector having an insulative housing having a conductive housing shield therein, a contact shield in the form of metallic ground structure, electrically commoned with the housing shield, which supports an insulative contact support member supporting a row of plural spaced electrical contacts thereon, the contact shield having a shield extension extending between at least two of the contacts, the contact shield including additional shield extensions, one additional shield extension bounding each side of the row of contacts. US-A-5160273 discloses a connector block assembly having a housing in which conductive shield plates are held in slots in the housing and extend between contacts. SUMMARY OF THE INVENTION It is an object of the present invention to provide an improved electrical data connector. It is a further object of the of the present invention to provide improved shielding in an electrical data connector. It is still a further objection of the present invention to provide improved shielding in a data connector so as to reduce cross-talk between contacts of the connector. According to the invention, there is provided a data connector comprising an insulative housing having a conductive housing shield therein, an insulative contact holding member supporting a row of plural spaced electrical contacts thereon, said insulative housing accommodating said holding member and a contact shield supported by the contact holding member, said contact shield having a shield extension extending between at least two of said contacts, said contact shield including additional shield extensions, one additional shield extension bounding each side of said row of contacts, said contact shield being electrically commoned with said housing shield, said contact holding member further including a pair of sidewalls bounding said row of contacts and a central dividing wall extending between at least two contacts, said sidewalls said central dividing wall of said holding member including slots therein, said shield extensions being accommodated in said respective slots in said sidewalls and said dividing wall so as to provide said support of the contact shield in the contact holding member. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows and exploded perspective view of components of the electrical data connector assembly of the present invention. Figure 2 shows the contact holder of the assembly of Figure 1. Figures 3, 4 and 5 show front, side and bottom views, respectively, of the improved contact shield of the assembly of Figure 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS: Referring to Figure 1, a shielded electrical data connector assembly 10 of the present invention is shown. Data connector 10 is of the type used to terminate a multiconductor shielded data cable (not shown) and is substantially similar to the connector shown in U.S. Patent No. 4,619,494, issued October 28, 1986, entitled "Shielded Electrical Connector," which is assigned the assignee of the present invention. Connector 10 comprises an insulative housing defined by a cover 12 and a base 14. Connector 10 also includes an upper electrically conductive shield 16, a lower electrically conductive shield 18, and a conductor termination sub-assembly 20, also shown in Figure 2. Cover 12 includes an elongate generally planar lid 24 supporting a latching mechanism 26. Base 14 includes a bottom wall 28 and an upstanding sidewall 30, which partially surrounds bottom wall 28. Sidewall 30 includes one or more cable entry ports 15 for accommodating the data cable. Base 14 also includes latching mechanism 32, which in combination with latching mechanism 26 of cover 12 permits interconnection of connector 10 with another similarly constructed connector in a manner described in greater detail in the above-identified '494 patent. Upper shield 16 is a planar metallic member which substantially encompasses the lower surface of cover 12. Lower shield 18 is also a planar member which covers the upper surface of bottom wall 28 of base 14. Depending shield members 34, extending from upper shield 16, engage lower shield 18 to provide electrical continuity therebetween. The manner in which upper shield 16 and lower shield 18 effectively shields connector 10 from EMI and RFI is also more fully described in the above-identified '494 patent. Housed between cover 12 and base 14 is conductor subassembly 20. With additional reference to Figure 2, conductor subassembly 20 includes an insulative contact holder 36 and a contact shield 38. Contact holder 36 comprises a bottom wall 40 and two transversely spaced upstanding sidewalls 42 and 44. A plurality of spaced parallel channels 46 are provided in bottom wall 40. A transverse wall 48 of height less than the sidewalls extends across the rear of bottom wall 40. Channels 46 are defined by longitudinal dividers 50 extending upwardly from bottom wall 40 with a central divider 50a having a greater thickness than the other dividers. A plurality of electrical contacts 52 are supported by holder 36. Contact 52 is an elongate member formed of a suitably conductive material and includes at the other end a conductor connection portion 54, which, as shown in Figure 2, is an insulation displacement contact portion for connection with the multiconductor cable. Contact 52 also includes at the other end a connection portion 56 for electrical connection with another similarly formed electrical contact. Contacts 52 are fixedly secured in holder 36 in respective channels 46 with dividers 50 electrically isolating each of the individual contacts 52. In the present embodiment, four contacts 52 are supported in holder 36. These contacts 52 considered in pairs, that is two contacts of one pair being on one side of divider 50a and two contacts of another pair being on the other side of divider 50a. In order to provide for reduced cross talk as between contacts 52, especially as between each pair of contacts supported on each side of divider 50a, the present invention contemplates interposing a contact shield 38 within contact holder 36. Contact holder 36 is modified from that shown in the above-identified '494 patent to have a plurality of slots 60 therein. A longitudinal central slot 60a extends from bottom wall 40 up through longitudinal central divider 50a along the length thereof. A pair of elongate lateral slots 60b and 60c extend from bottom wall 40 up through sidewalls 42 and 44 respectively. Referring additionally now to Figures 3 through 5, contact holder 36 is constructed to accommodate contact shield 38 therein. Shield 38 is a metallic member formed of stamped material, having a bottom planar surface 62, which is constructed to be in conformance with bottom wall 40 of holder 36 and a pair of upstanding transversely spaced side extensions 64 and 66. A planar central extension 68 extends upwardly from planar surface 62 between side extensions 64 and 66. Side extensions 64 and 66 are constructed to be received within lateral slots 60b and 60c, respectively, and central extension 68 is designed to be received within central slot 60a of contact holder 36. Each of side extensions 64 and 66 and central extension 68 are of sufficient height and length to span the length of elongate contacts 52 to provide cross-talk shielding for the contacts supported between dividers 50 of holder 36. Specifically, central extension 68 shields the pair of contacts 52 on one side of divider 50a from the pair of contacts 52 on the other side of divider 50a. In order to insure that contact shield 38 is commoned with the shield of connector 10, contact shield 38 includes a plurality of electrical engagement fingers 70 thereon. Planar surface 62 of shield 38 includes four dual-beam contact fingers 70, which are in the form of cantilevered spring elements struck from the surface thereof. Dual beam contact fingers 70 extend downwardly to engage lower shield 18 of base 14 to establish electrical engagement therewith. In addition, side extensions 64 and 66 include lances 74, which are struck outwardly from the surface thereof. Lances 74 engage sidewalls 42 and 44 within slots 60b and 60 to frictionally secure contact shield 38 on contact holder 36. As can be appreciated, electrical continuity is maintained as among upper shield 16, lower shield 18, and contact shield 38. The electrically continuous shield established will not only shield the connector from external EMI and RFI, but will also provide cross-talk reduction as between pairs of contacts 52 supported within connector 10. Various changes to the foregoing described and shown structures would now be evident to those skilled in the art. Accordingly, the particularly disclosed scope of the invention is set forth in the following claims.

Claims: A data connector comprising: an insulative housing (12,14) having a conductive housing shield (16,18) therein; an insulative contact holding member (36) supporting a row of plural spaced electrical contacts (52) thereon, said insulative housing (12,14) accommodating said holding member (36); and a contact shield (38) supported by the contact holding member (36), said contact shield (38) having a shield extension (68) extending between at least two of said contacts (52), said contact shield (38) including additional shield extensions (64,66), one additional shield extension (64,66) bounding each side of said row of contacts (52), said contact shield (38) being electrically commoned with said housing shield (16,18), said contact holding member (36) further including a pair of sidewalls (42,44) bounding said row of contacts (52) and a central dividing wall (50a) extending between at least two contacts (52), said sidewalls (42,44) said central dividing wall (50a) of said holding member (36) including slots (60a,60b,60c) therein, said shield extensions (68,64,66) being accommodated in said respective slots (60a,60b,60c) in said sidewalls (42,44) and said dividing wall (50a) so as to provide said support of the contact shield (38) in the contact holding member (36). A data connector of claim 1 wherein said contact shield (38) includes spring fingers (70) for electrical engagement with said conductive shield (18) of said housing.

Inventors: MAROWSKY RICHARD, PODGALSKY RICHARD, RODRIGUES JULIO F, MAROWSKY, RICHARD, PODGALSKY, RICHARD, RODRIGUES, JULIO F.
Applicants: THOMAS & BETTS CORP, THOMAS & BETTS CORPORATION (A TENNESSEE CORPORATION)
Application year: 1994
Main classification: H01R13
IPC codes: H01R13